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Re: [Qemu-devel] [PATCH 07/12] qemu-thread: add QemuSemaphore

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 07/12] qemu-thread: add QemuSemaphore
Date: Mon, 16 Jul 2012 15:35:56 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120615 Thunderbird/13.0.1

Il 16/07/2012 15:34, Jan Kiszka ha scritto:
> On 2012-07-16 15:20, Paolo Bonzini wrote:
>> Il 16/07/2012 14:00, Jan Kiszka ha scritto:
>>> On 2012-07-16 12:42, Paolo Bonzini wrote:
>>>> The new thread pool will use semaphores instead of condition
>>>> variables, because QemuCond does not have qemu_cond_timedwait.
>>> I'll post an updated patch (according to last round's review comments)
>>> that adds this service for POSIX. I bet you'll find a way to extend it
>>> to Win32 if that is required. ;)
>> I can do that (or just use pthreads-win32), but only at the cost of
>> making cond_wait() slower and more complex.
> Why will it affect cond_wait? WaitForSingleObject can time out as well.

qemu_cond_wait only uses WaitForSingleObject with INFINITE timeout, and
the algorithm relies on that.


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